Monthly weather forecast and Climate
Rio de Janeiro, Brazil BR

Warmest months (with the highest average high temperature) are January and February (30.2°C).
The month with the lowest average high temperature is July (25°C).

The month with the highest average low temperature is February (23.5°C).
The coldest month (with the lowest average low temperature) is July (18.4°C).

Months with the highest relative humidity are March, April, May, October and December (80%).
Months with the lowest relative humidity are July and August (77%).

The wettest month (with the highest rainfall) is January (137.1mm).
The driest month (with the lowest rainfall) is July (41.9mm).

Months with the highest number of rainy days are January and December (11 days).
The month with the lowest number of rainy days is July (4 days).

Best months for swimming (with the highest average sea temperature) are February and March (26°C).
Coldest months (with the lowest average sea temperature) are July, August, September and October (22°C).

The month with the longest days is December (Average daylight: 14h).
Months with shortest days are May, June, July and August (Average daylight: 11h).

The month with most sunshine is February (Average sunshine: 7.2h).
Months with least sunshine are September and October (Average sunshine: 4.9).

Months with the highest UV index are January, February, March, November and December (UV index 12).
Months with the lowest UV index are June and July (UV index 5).